After harvesting the grain mass is mixed with pretty large quantity of various additives and of course such product has low quality. Absolutely clear, that there are some definite standards to control the additives content. If it is higher than established rate, one should take some specific measures to make it possible to use the product by purpose. However, even if the standards are kept on right level, grain mass have to be cleaned to lower its physiological activity provoked by a great number of microorganisms.

No wonder that the grain cleaning is absolutely necessary process for grain treatment after harvesting. This procedure is fulfilled by special grain cleaning machines, which not only clean, but also separate grain according to different features.

Generally, all agricultural equipment used for grain cleaning can be divided into three groups:

special grain cleaners, fulfilling non-standard operations such as electromagnetic cleaning and also separating and air-powered tables.

Besides, grain cleaners are classified as stationary and movable ones. The grain cleaners of the first type are used in granaries, at outside and inside areas, the others at granary complexes, КЗС, seed lines and manufactures with mass line production.

Functioning of grain cleaners depends on grain features. Physical and mechanical indexes and aerodynamics are the most important factors here. According to the method of cleaning several types of machines can be singled out. These are the main ones:

air-powered grain cleaners for cleaning the grain mass within air chambers by airflow;

latticed grain cleaners, which divide the grain by size sieving it through the lattices;

triers, separating the grain by length.

Grain cleaners can differ greatly by their characteristics and accordingly by their prices. For example , productivity can vary between 4 to 400 ton per hour. Everything depends here on the size of manufactory. Absolutely clear, that it is not possible and not always necessary to use equipment with the maximum indexes.

We should also point that the demands to grain cleaners today are very strict and not only in grain purity but also in loss of grain.